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Re:IRS to Begin Trial of Its Own Free Tax-Filing System by PopAlongKid on Saturday January 06, 2024 @04:22PM (#38895620)
>I have a hard time understanding why the IRS doesn't at least have a basic web portal for individuals and businesses to do simple things

They do have such a portal which does some of the things you list and several other things too.

https://www.irs.gov/payments/your-online-account

Re:IRS to Begin Trial of Its Own Free Tax-Filing System by arbuge on Saturday January 06, 2024 @05:06PM (#38895985)
Yes, I know about that. It has a limited subset of the functionality I mention - for individuals. Does not exist for businesses.
Re:IRS to Begin Trial of Its Own Free Tax-Filing System by PopAlongKid on Saturday January 06, 2024 @05:59PM (#38896452)
Yes, there is one for business too.

https://www.irs.gov/businesses/business-tax-account

How do we know that your list better matches the most common desired/needed features than the initial implementation by the IRS?

IRS business features:

Sole proprietors with EIN

A sole proprietor who files with an EIN can:

    View business balance due 
    View business tax records
    View select digital notices 
    Request a tax compliance check 
    View business name and address on file 
    Give account access to your employees 
    Register for clean energy credits (if eligible) 
Partners and shareholders

An individual partner or shareholder with access can:

    View business balance due 
    View business tax transcripts 
    View business name on file 
Access for more business types and roles coming soon.
Re:IRS to Begin Trial of Its Own Free Tax-Filing System by rufus_foreman on Saturday January 06, 2024 @06:48PM (#38896830)
Last time I tried to use it, they wanted me to take a selfie and send it to them in order to be able to pay estimated taxes.